<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <!--登录页面-->
    <div>
        <form action="/login" method="post">
            <p>用户名：<input type="text" name="username" value="蔡徐坤"></p>
            <p><input type="submit" value="提交"> </p>
        </form>
    </div>
</body>
</html>